Staging: comedi: add mpc624 driver

driver for a Micro/sys inc. MPC-624 PC/104 board

From: Stanislaw Raczynski <sraczynski@op.pl>
Cc: David Schleef <ds@schleef.org>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>